Water filter



FIG. 1 is a perspective view taken from the top, front, and left side of a water filter showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof; and

FIG. 6 is a top plan view thereof, the bottom being unornamented. 

The ornamental design for a water filter, substantially as shown and described. 